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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbd04ec3c407dc683a2dd8f2e3bf04f830d7d67dc91d8db814029c044b7f7c2a' 
  AND token = 'ZNFaHolrnslHHKMDT6dLRInE8dubUPyscd+gSzeep20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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