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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3460d813ee385d2be19d8f80543be035badf5508e080c57865e6752f013442e7' 
  AND token = 'y7Co+2/3yrqVql/C7z/HvrbpBEEdbeFRIjfniHzcnpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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