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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93dfbbf84eb27b6e3a74ffea6ba70e6e25265e54ad80b33d84a4d8b7da0935b5' 
  AND token = '3mCNhD9/tklkpZ3LWe/psM3/OXh17FVf8sr6IRtNiXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}