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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2186735dfe28160882bd6734e7c6f40678acafb277455d1e7f8d25918efdc5a6' 
  AND token = 'bmT13KJmCT9e0ap7H95HsV6U2uSTTtjP2boXIHNwZyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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