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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70bd6cf58e610a2956aa7ff90755bd3e69f6f8f5d296b962a817ef32c88dc9a9' 
  AND token = 'IJAC5qibQdhSGrpiD2gDvpyTEEnOtBZIiSs/vb3r2Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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